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Oracle® Application Server TopLink Mapping Workbench User's Guide
10g Release 2 (10.1.2)
Part No. B15900-01
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Optimizing for Queries

You can configure query optimization on any relationship mappings. The optimization requires fewer database calls to read a set of objects from the database. You can configure query optimization on a descriptor's mappings to affect all queries for that class, resulting in a significant system performance gain without changing any application code. Queries can also be optimized on a per-query basis. For more information, see the Oracle Application Server TopLink Application Developer's Guide.

OracleAS TopLink provides two query optimization features on mappings: joining and batch reading.